Renown doctor, T. Colin Campbell, Ph.D. Author of ‘The China Study’, a must read, has documented casein in cow’s milk is the most significant carcinogen we consume. Carcinogens genetically transform normal cells into cancer-prone cells. Dr. T. Colin Campbell has extensive research on this subject and also just happened to grow up on a dairy farm even milking cows. For more information please visit his website and please read the book.
http://nutritionstudies.org/provocations-casein-carcinogen-really/